In 1859, Charles Darwin proposed his theory of evolution based on natural selection. What
observation about the natural world does this
theory explain?
O how the fossil record was formed
O how species change over time
how a species ahvays retains its characteristics
how catastrophic events lead to extinctions

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

no u

flooding wildfire landslides climate change the factors listed have an immediate effect on the animal populations found in any habitat. the four factors would lead to a death. b emigration. eliminate c immigration. d mutations.